Tungsten Wire Specifications

Tungsten filament has a resistivity of 5.3 × 10⁻⁸. Tungsten has a high melting point, high resistivity, good strength, and low vapor pressure, making it the best material among all pure metals for incandescent lamp filaments. However, tungsten is hard and brittle, making it difficult to process. When an electric current passes through a tungsten filament and it is heated to a certain temperature, the filament's resistance increases to a certain value (the resistance of most metal wires increases with temperature). In 1909, Coolidge invented the tungsten filament processing technology, which played a decisive role in the production and popularization of incandescent light bulbs, and its basic principles are still used today.

Grade, Characteristics, and Applications

WB001: Good winding performance, no sag, suitable for ordinary incandescent lamps, double-helix or triple-helix fluorescent lamps, holiday lights, support filaments, etc.

WB150: Good high-temperature resistance, excellent processing performance, suitable for halogen lamps, double-helix incandescent lamps, etc.

WB584: High recrystallization temperature and good high-temperature anti-sagging performance, suitable for special lamps such as shock-resistant filaments and high color temperature filaments.